#include<iostream>
#include<cstdlib>
#include<vector>
using namespace std;
#define ELemType struct
#define status int
#define OK 1
#define ERROR 0
#define MAX_SIZE 100

#define print(x) printf("%8s",x)
struct stu{
    int no;
    char name[20];
    int phone;
};
struct sys{
    struct stu;
    struct sys *next;
};

void addStu(){
    
}

int main(){
    print("请输入操作");
    print("1.");
    print("1.");
    print("1.");
    print("1.");
    int op;
    cin>>op;
    switch (op)
    {
    case 1:
        addStu();
        break;
     case 2:
        addStu();
        break;
     case 3:
        addStu();
        break;
     case 4:
        addStu();
        break;
    
    default:
        break;
    }
}